Automatic sorting of mailing lists with maildrop

I am subscribed to many mailing lists. Creating filters for them was usually pain but keeping all in one folder was also not useful. So I decided to make it more automatic.

There are many pages which will tell you how to use maildrop, how nice it is etc. But as I am used to “autofolder” set of procmail rules written by Kamal Mostafa from Canonical I had some requirements already and some ideas how to handle few things in other way.